Keyboard



FIG. 1 is top view of a keyboard in accordance with the present invention;

FIG. 2 is a front elevational view of the keyboard of FIG. 1;

FIG. 3 is a rear elevational view of the keyboard of FIG. 1;

FIG. 4 is a first side elevational view of the keyboard of FIG. 1; and,

FIG. 5 is a side view of the keyboard of FIG. 1.

The broken line showing of environment forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 